Pass before the people: And see whether they stone you. Why have you slandered My children?-[from Tanchuma Beshallach 22]

עבר לפני העם: וראה אם יסקלוך, למה הוצאת לעז על בני:

and take with you [some] of the elders of Israel: for testimony, so that they shall witness that through you the water comes out of the rock, and they [the Israelites] will not say that there were water fountains there from days of yore. — [from Mechilta]

your staff, with which you struck the Nile: Why must Scripture state "with which you struck the Nile"? [To point out what] the Israelites were saying about the staff, [namely] that it was ready only for retribution. With it, Pharaoh and the Egyptians were smitten with many plagues, both in Egypt and by the sea. Therefore, it is stated: “with which you struck the Nile.” Now they will see that it [the staff] is ready for good as well. — [from Mechilta, Exod. Rabbah 26:2]

6Behold, I shall stand there before you on the rock in Horeb, and you shall strike the rock, and water will come out of it, and the people will drink Moses did so before the eyes of the elders of Israel.

and you shall strike the rock: Heb. וְהִכִּיתָ בַצּוּר. It does not say עַל-הַצּוּר, upon the rock, but בַצּוּר, [lit., into the rock]. From here [we deduce] that the staff was of a hard substance called sapphire, and the rock was split by it. — [from Mechilta]

Amalek came, etc.: He [God] juxtaposed this section to this verse, ["Is the Lord in our midst or not? "] implying: “I am always among you, and [I am] always prepared for all your necessities, but you say, Is the Lord in our midst or not?’ By your life, the dog will come and bite you, and you will cry out to Me, and [then] you will know where I am ” This can be compared to a man who mounted his son on his shoulder and set out on the road. Whenever his son saw something, he would say, “Father, take that thing and give it to me,” and he [the father] would give it to him. They met a man, and the son said to him, “Have you seen my father?” So his father said to him, “You don’t know where I am?” He threw him [his son] down off him, and a dog came and bit him [the son]. — [from Tanchuma, Yithro 3; Exod. Rabbah 26:2]

Pick…for us: For me and for you. From here the Sages stated: “Your disciple’s honor shall be as dear to you as your own honor” (Avoth 4:12). How do we know that you should honor your peer as you revere your mentor? For it is said: “Aaron said to Moses, I beseech you, my lord’ ” (Num. 12:11). Now was Aaron not older than Moses? Yet he [Aaron] considers his peer as his mentor. And how do we know that one must revere his mentor as he reveres Heaven? For it is said: “My lord, Moses, destroy them” (Num. 11:28). Destroy them [Eldad and Medad] from the world. They deserve to be annihilated because they are rebelling against you, [which is] tantamount to having rebelled against the Holy One, blessed be He. — [from Mechilta; Tanchuma, Beshallach 26]

and go out and fight: Go out of the cloud and fight with them. — [from Mechilta and Exod. Rabbah, end of Beshallach]

וצא הלחם: צא מן הענן והלחם בו:

Tomorrow: At the time of the battle, I will stand.

מחר: בעת המלחמה אנכי נצב:

Pick men for us: Heb. אִנָשִׁים, mighty men, and God-fearing [men] so that their merit will help us (Mechilta d’Rabbi Shimon ben Yochai, Pirkei d’Rabbi Eliezer ch. 44, Yalkut Shimoni, Jonathan). Another explanation: who know how to counteract witchcraft, because the Amalekites were sorcerers.

when Moses would raise his hand: Did Moses’ hands then make them victorious in battle, etc.? [Rather this is to tell you that when the Israelites looked up and subjugated their hearts to their Father in heaven, they would prevail, and if not, they would fall,] as is found in Rosh Hashanah (29a).

12Now Moses hands were heavy; so they took a stone and placed it under him, and he sat on it. Aaron and Hur supported his hands, one from this [side], and one from that [side]; so he was with his hands in faith until sunset.

Now Moses’ hands were heavy: Since he had been lax in [the performance of] the commandment [of warring against Amalek] and had appointed someone else in his stead, his hands became heavy. — [from Mechilta]

וידי משה כבדים: בשביל שנתעצל במצוה ומנה אחר תחתיו, נתייקרו ידיו:

so they took: [I.e.,] Aaron and Hur.

ויקחו: אהרן וחור:

a stone and placed it under him: But he [Moses] did not sit on a mattress or on a pillow, [because] he said, "Israel is in a state of pain. I too will be with them in pain."-[from Ta’anith 11a]

until sunset: For the Amalekites calculated the hours [i.e., the time] with their astrology [to determine] in what hour they would be victorious, but Moses caused the sun to stand still and confused the hours. — [from Tanchuma 28]

Joshua weakened: He decapitated their [the Amalekites’] strongest warriors, and he left over only the weak among them, but he did not slay them all. From here we learn that he did this according to the mandate of the Shechinah. — [from Mechilta]

Inscribe this [as] a memorial: namely that Amalek came to attack the Israelites before all [other] nations [dared to do so].

כתב זאת זכרון: שבא עמלק להזדווג לישראל קודם לכל האומות:

and recite it into Joshua’s ears: [Joshua] was destined to bring Israel into the land [of Israel and] to pay him [Amalek] his recompense. Here it was hinted to Moses that Joshua would bring Israel into the land. — [from Tanchuma 28, Mechilta]

“The Lord is my miracle”: Heb. ה נִסִּי. The Holy One, blessed be He, wrought a great miracle for us here. Not that the altar is called “The Lord,” but whoever mentions the name of the altar remembers the miracle that the Omnipresent performed: The Lord is our miracle. — [from Mechilta]

For there is a hand on the throne of the Eternal: Heb. כִּי-יָד עַל כֵּס יָ-הּ. The hand of the Holy One, blessed be He, was raised to swear by His throne, to have a war and [bear] hatred against Amalek for eternity. Now what is the meaning of כֵּס [as opposed to כִּסֵא and also [why is] the Divine Name divided in half? [I.e., why is the Name יָ-הּ used instead of י-ה-ו-ה ?] [The answer is that] the Holy One, blessed be He, swore that His Name will not be complete and His throne will not be complete until the name of Amalek is completely obliterated. And when his name is obliterated, the Divine Name will be complete, and the throne will be complete, as it is said: “The enemy has been destroyed; swords exist forever (לָנֶצַח)” (Ps. 9:7); this [who they are referring to] is Amalek, about whom it is written: “and kept their fury forever (נֶצַח)” (Amos 1:11). "And You have uprooted the cities-their remembrance is lost" (Ps. 9:7) [i.e., Amalek’s obliteration]. What does it say afterwards? “And the Lord (וַיהוה) shall sit forever” (Ps. 9:8); thus [after Amalek is obliterated] the Name is complete. "He has established His throne (כִּסְאוֹ) for judgment" (Ps. 9:8). Thus the throne is complete [i.e., thus the throne, here spelled with an “aleph,” is now complete]. — [from Midrash Tanchuma, end of Ki Theitzei]